'White' in the Bible

I was seeing till that thrones have been thrown down, and the Ancient of Days is seated, His garment as snow is white, and the hair of his head is as pure wool, His throne flames of fire, its wheels burning fire.

And some of the teachers do stumble for refining by them, and for purifying, and for making white -- till the end of the time, for it is yet for a time appointed.

Purify themselves, yea, make themselves white, yea, refined are many: and the wicked have done wickedly, and none of the wicked understand, and those acting wisely do understand;